By the end of last year the students (learn) ______ nine subjects.

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问题 By the end of last year the students (learn) ______ nine subjects.

选项

答案had learnt

解析本题考查时态。此句的时间状语是by the end of last year，由此可以判断该句为过去完成时。

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大学英语三级B级

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